"Mantoux Testing in Uveitis Patients and Treatment of Presumed Intraocular Tuberculosis in Western Up"

Abstract

Tuberculosis is re-emergingasaglobalhealthproblem.Itisaslowlyprogressive,chronic,granulomatous infectioncausedby M.tuberculosiswhichusuallyaffectslungs,butcanalsoaffectotherorganslikeCVS,GI,CNS,SKINandEYES. Choroidal tubercles and tuberculomas are reported to be the most common intraocular manifestations of TB and the most commonintraocularclinicalpresentationappearstobeposterioruveitis. ThediagnosisofocularTBisconsideredinsettingsof1.IsolationofM.tuberculosisfromocularfluidsortissuespecimen.Byamicrobiologicalorhistopathologicalstudy,PCR. 2.AspresumedoculardiseasesuggestiveofTBwithprovensystemicactivedisease. 3.Presumedoculardiseasewithoutevidenceofactivesystemicdisease. DiagnosticCriteriaForPresumedIntraocularTbUveitiswere. 1.Ocular findings consistent with possible intraocular TB with no other cause of uveitis suggested by history of symptoms,or ancillarytestings. 2.StronglypositiveMANTOUX OR TUBERCULINSKINTESTING(>10mmareaofinduration/necrosis) 3.Responsetoantituberculartherapywithabsenceofrecurrences. The aims of our study were to evaluate prevalence of Mantoux positive in newly referred uveitis patients in whom systemic evaluationwasperformedandtoassesstheoutcomeoftreatmentforpresumedintraoculartuberculosisinselectedpatients. MATERIALANDMETHOD The studywas conductedin theRetinaClinic atUpgradeddepartmentof Ophthalmology,LLRM medicalcollege,Meerut,India.Itwasaprospective,noncomparative,interventionalcaseseries. PatientsofocularinflammationreferredtoRetinaClinicwhounderwentsystemicevaluationwereincludedinthestudy A total of patients who satisfy the inclusion criteria , underwent systemic evaluation which include blood tests, chest radiograph,and tuberculin skin testing (0.05 _g purified protein derivative in 0.1 ml,equivalent to 2.5 tuberculin units) Both erythema and induration was measured at 48 hours,and the result were judged to be positive if induration was more than 10 mm Antituberculosis therapyi.eisoniazid300mg/day,rifampin600mg/day,ethambutol 15mg/kg/day,andpyrazinamide25–30 mg /kg/ day for the first 2 months ,thereafter rifampin and isoniazid were used for another 4–7 months was initiated for patients who had clinical findings consistent with possible intraocular tuberculosis,a positive tuberculin skin test result Responsetotherapywasassessedintermsofincreaseordecreaseorresolution OBSERVATIONAND RESULT Ofthe total 32patients 9patients havepositive tubercular contact history and30patientswere mantouxpositive.(94%),ofwhich78%havetheirindurationsizeof>15mmand8patientshavepositivex-rayfindings.(25%) Out of these 32 patients, 25 received antituberculous therapy for 9 months. In addition all of these patients also received systemicprednisone(1mg/kg/day)untilaclinicaleffectwasseenandthenaslowreductionofdosewasdone. 7patientsweredroppedoutfromthestudy. Out of these 25 patients which were started on treatment, 24 patients (96%) showed improvement in their clinical status, 19 patients (76%) showed improvement in their visual acuity after treatment and 35.6 % patients attained visual acuity of 6/9 or better. CONCLUSION Treatment with antitubercular therapy combined with systemic corticosteroids induces resolution of inflammation with no recurrences. So, mantoux testing should remain an integral part of the systemic work-up for uveitis patients.